vpasswd file got corruptted. urgent!

My vpasswd got corruptted.Why and how to do? I hove 5M users in single domains I used qmail1.03+vpopmail4.9+cdb+sqwebmail --- 163µç×ÓÓʾ֣¬¸øÄú¸üÍêÃÀEmail·þÎñ£¡ http://www.163.net

add user problem?

when I add user by command vadduser. it is fault. Display: segment fault(core dumped? --- 163µç×ÓÓʾ֣¬¸øÄú¸üÍêÃÀEmail·þÎñ£¡ http://www.163.net

about cdb,mysql,oracle

I have 50K user in single domains.I authenticate user by cdb. What advance suggestions to me. --- 163µç×ÓÓʾ֣¬¸øÄú¸üÍêÃÀEmail·þÎñ£¡ http://www.163.net

vadduser user problem,Urgent!!!!!

Hi who can help me? I add user by vchkpw's API vadduser function.on web. but it frequently happen to as below error message: >> >user directory aready exit. >please contact administrator. I am not adduser the same userneme before this Why?.